I don't see any blockchain solve or help Covid-19, I see folding helping Covid-19 Issues.
To be sincere, blockchain can be used to solve some aspect of the Covid-19.
1) Through cryptocurrency which limits the contact between individual and that's one of the reasons the government are planning to create Central Bank digital currency.
2) There are various blockchain applications and opportunities in combating the COVID-19 pandemic i.e development a tracking system for the COVID-19 data collected from various external sources.
3) It can be used to improved clinical trial data management by reducing delays in regulatory approvals, and streamline the communication between diverse stakeholders of the supply chain.